/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Creates a pie world from the default entry map, used by clients that connect to a PIE server
[UWorld](API\Runtime\Engine\Engine\UWorld) * CreatePIEWorldFromEntry ( [FWorldContext](API\Runtime\Engine\Engine\FWorldContext) & WorldContext, [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, [FString](API\Runtime\Core\Containers\FString) & PlayWorldMapName )